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Molisch test (using α-napthol) indicating a positive result (see purple ring). Molisch's test is a sensitive chemical test, named after Austrian botanist Hans Molisch, for the presence of carbohydrates, based on the dehydration of the carbohydrate by sulfuric acid or hydrochloric acid to produce an aldehyde, which condenses with two molecules of a phenol (usually α-naphthol, though other ...
Calliostoma annulatum, also known as the purple-ring topsnail, blue-ring topsnail or jeweled topsnail, is a medium-sized sea snail with gills and an operculum. [ 1 ] This is a sublittoral marine gastropod mollusk in the family Calliostomatidae .
A purple ring appears between the two layers if the test is positive for tryptophan. [2] [3] Nitrites, chlorates, nitrates and excess chlorides prevent the reaction from occurring. [4] The reaction was first reported by Frederick Gowland Hopkins and Sydney W. Cole in 1901, [5] as part of their work on the first isolation of tryptophan itself.
A power ring is an object featured in American comic books ... Its members are capable of using Ultraviolet energy which takes the form of purple/violet light ...
A diagram of an aromatic ring current. B 0 is the applied magnetic field, the red arrow indicating its direction. The orange ring shows the direction of the ring current, and the purple rings show the direction of the induced magnetic field. An aromatic ring current is an effect observed in aromatic molecules such as benzene and naphthalene.
A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [ 2 ]